如题所述
10Ããï¼4/5-0.5÷3/7ã=ï¼2.7-4.25Ã2/5ï¼Ã·2.8Ã4/7=
10Ããï¼4/5-0.5÷3/7ã=10Ããï¼4/5-7/6ã=10Ã(-11/30)=-11/3ï¼2.7-4.25Ã2/5ï¼Ã·2.8Ã4/7=ï¼2.7-1.7ï¼Ã·2.8Ã4/7=1÷2.8Ã4/7=5/14Ã4/7=10/49